MFL teacher not primary, but some fun strategies I use for spelling/literacy are:
Walking dictation - in pairs. Passage on one side of the room, one of the pair goes up to memorise one word at a time - with spelling. Says aloud to partner, who writes it down. Then partner's turn. They can correct each other's if they discuss why.
Sometimes I do points for each correct word, or fastest team to finish are winners, or not as a competition, depending on the fairness of the groupings.
Chinese whisper spelling
Writing out the spelling words with some medium other than pen and paper - mini w/bs are easiest, but pasta, string etc.
Body shapes spelling. You say the word, class to make a shape of each letter with body.
Body shapes reading - other way round
Sign language - basic sign language - spelling out words and understanding meaning
Do you know the game 11s? You can do this with spellings. Pupils stand up in an order (define this beforehand) start by saying the word. I tend to do boys v. girls or houses or whatever to turn into competition. Pupil 1 can say 1, 2 or 3 consecutive letters. The person who says the last letter has to sit down. If you make a mistake you start again. (Some people do mistakes sit down but I don't think this is fair).
Songs. For tricky words, split into groups and give one word each. Set time limit for each group to make a short jingle to explain the spelling of each word. After time limit, they have to teach to the others.
Have you tried memrise.com? Not sure if they have something set up for spellings in particular but have a look at it, as you can create your own mnemonics for the class, they earn points and is v motivational.
There are loads of other websites that can help you. Look for EAL stuff as well as primary stuff. Linguascope is good for EAL., and again you can create your own games - snakes and ladders etc.
Simple games like snakes and ladders or anything with dice are good. Have your spelling words cut out and in a bag for each group. To have your turn you have to spell the word correctly
For any really persistently difficult spellings, I like to make a graduated blankfill game. For this I select 10-12 words. Divide the page into four. Top left hand I have the words in full, top right I have the starting letter, blank, letter, blank etc. Bottom left I just have blanks, bottom right I leave totally blank.
We talk about memory learning methods in general, I say we are going to look at three different learning methods. They fold their paper so they can only see top left.
All pupils have two minutes to look at the words, noticing anything they can about them - what they mean, what they are similar to, anything at all that sticks out. We then discuss all these things in great detail.
I then ask them to turn to top right and fill it out without looking at top left. Set a time limit. Count how many they got right.
Then we have two/or three, depending on group minutes repeating the list of words as a group. Over and over for two minutes.
I then ask them to fill out bottom left. Did their score improve?
Then We have two minutes doing look, cover, write, check. Complete bottom right. Look at improvement. Discuss how they found each exercise.
Allow them to identify which worked best for them but stress that each of those skills is important - it is the three together, along with the action of repeatedly writing that helped them to memorise the words.
If time left, I get them to choose 5-8 of their own words to challenge themselves with.
I can think of loads more things, but not sure if this is helpful from a primary POV. If so, let me know and I'll add. :)
Hope it helps, good luck. :)